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authorPeter Xu <peterx@redhat.com>2022-10-01 03:25:55 +0300
committerAndrew Morton <akpm@linux-foundation.org>2022-10-13 01:56:46 +0300
commit515778e2d790652a38a24554fdb7f21420d91efc (patch)
tree0e5e96ac55e5d986733bbd2d60746eab134792d7 /mm/mprotect.c
parent28c5609fb236807910ca347ad3e26c4567998526 (diff)
downloadlinux-515778e2d790652a38a24554fdb7f21420d91efc.tar.xz
mm/uffd: fix warning without PTE_MARKER_UFFD_WP compiled in
When PTE_MARKER_UFFD_WP not configured, it's still possible to reach pte marker code and trigger an warning. Add a few CONFIG_PTE_MARKER_UFFD_WP ifdefs to make sure the code won't be reached when not compiled in. Link: https://lkml.kernel.org/r/YzeR+R6b4bwBlBHh@x1n Fixes: b1f9e876862d ("mm/uffd: enable write protection for shmem & hugetlbfs") Signed-off-by: Peter Xu <peterx@redhat.com> Reported-by: <syzbot+2b9b4f0895be09a6dec3@syzkaller.appspotmail.com> Cc: Axel Rasmussen <axelrasmussen@google.com> Cc: Brian Geffon <bgeffon@google.com> Cc: Edward Liaw <edliaw@google.com> Cc: Liu Shixin <liushixin2@huawei.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/mprotect.c')
-rw-r--r--mm/mprotect.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 461dcbd4f21a..668bfaa6ed2a 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -267,6 +267,7 @@ static unsigned long change_pte_range(struct mmu_gather *tlb,
} else {
/* It must be an none page, or what else?.. */
WARN_ON_ONCE(!pte_none(oldpte));
+#ifdef CONFIG_PTE_MARKER_UFFD_WP
if (unlikely(uffd_wp && !vma_is_anonymous(vma))) {
/*
* For file-backed mem, we need to be able to
@@ -278,6 +279,7 @@ static unsigned long change_pte_range(struct mmu_gather *tlb,
make_pte_marker(PTE_MARKER_UFFD_WP));
pages++;
}
+#endif
}
} while (pte++, addr += PAGE_SIZE, addr != end);
arch_leave_lazy_mmu_mode();